Talk:Soakaways, Infiltration Trenches and Infiltration Chambers Guide
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LID Practice | CANADA | United States | |||||||
---|---|---|---|---|---|---|---|---|---|
Soakaways, Infiltration Trenches and Chambers | CVC+TRCA (Factsheets-2010)[1] | Toronto- 2016 | LID-SWM Guide 2010[2] | Massachusets SW BMP-2013 | District of Columbia-SWM Guidebook-2010 | W. Virginia-SWM design guidance manual-2012 | Pennsylvania-City of Philadelphia green St. design manual-2014 | Oregon SWM Manual-2014 | |
Setback from Building Foundation (m) | 4 | 4 | |||||||
(Impervious Drainage/Treatment) Area | 5:1-20:1, 10:1 recommended | 5:1-20:1, 10:1 recommended | CDA < 5 acres | CDA < 2 acres (T), < 5 acres (B) | < 2 acres | Max. load of 10:1 for infiltration systems (not specific to LID type) | |||
Natural Slope (%) | < 15 | < 15 | |||||||
A capped vertical standpipe, perforated installed to the bottom of the facility to monitor drainage time (mm) | 100-150 | 100-150 | |||||||
Filter media | |||||||||
Stone Resvoir | 1.5" to 3" stone dia., 2" pea gravel above 6" sand below | 1.5"-3.5" stone dia. For stone layer, 3" layer of washed river stone, or No. 8 or 89 stone above, 6-8 " of sand below | Stone 1.5"-3.5" | Drain rock 3/4"-2.5 " washed open graded aggregate | |||||
Void Space(%) | 30-40 | 30-40 | 30-40 | ||||||
Granular Material (clear stone)(mm) | 50 | 50 | 50 | ||||||
Geotextile around the stone reservoir with an overlap at the top (mm) | min. 300 | 300 | min. 300 | ||||||
Bottom Width of Excavations (mm) | 600-2400 | 600-2400 | 600-2400 | ||||||
Minimum Depth of Excavations under concrete laneway (mm) | 3000 | ||||||||
Length of Time for Draining after Storm Event (>25mm) | max. 72 hr. | max. 72 hr., 48 hr. recommended | |||||||
Depth to High Water Table (m) | 1 | 1 | |||||||
Sand Layer Depth (mm) | 150-300 | Length of Time for Draining after Storm Event (>25mm) | |||||||
Subdrains Inlet Pipes (mm) | 100-200 | ||||||||
Overflow is required when the infiltration rate equals | < 15 mm/hr | ||||||||
Facilities receiving road runoff are not located within time of travel wellhead protection areas (years) | 2 | 2 |